题目内容

13码中的前缀码是国家代码，中国的代码一般为690-695.（）

A. 对
B. 错

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14码的应用对象是向消费者销售的商品，应用于订货管理的过程。（）

A. 对
B. 错

--What are you going to do tomorrow?--We’ll go to the library tomorrow if it _____.

A. isn’t rain
B. rain
C. won’t rain
D. doesn’t rain

Sam didn't seem too disappointed at losing. _____ anything, he seemed relieved that it was all over.

A. Unless
B. If
C. While
D. Though

_____ I believe it is true, I cannot prove it.

A. Because
B. When
C. While
D. Whereas